2015-11-11 - Birmingham (UK/England) - Unknown

I was out in my garden around 23:00pm looking at the stars, it was a clear night and a very mild temperature for November. But then, i noticed what i thought was a aeroplane quite high up. I'm not entirely sure of how high this object was but roughly about 400/500 feet in the air. Anyway i followed it for a bit but noticed this object i saw, its lights were changing from flashing red on one side of the object and permanent blue on the other side. Right through to orange/yellowish to just a white light. I knew this could not be a plane as its course was quite sporadic and not only that, I live on a flight path (so i see planes virtually every day). And it definitely was not a helicopter as I couldn't here the distinctive sound of the rotor blades. I watched this object for 9 mins and 23 seconds before it disappeared. I had possibly seen the same object a few weeks prior, but didn't take much notice. I suppose curiosity got the better of me.